[volt-nuts] Solartron 7081, other meters, and some voltage standards

Sat Sep 3 01:40:05 UTC 2011

OK.  Where would you send a 731B with a 'non-standard' battery pack for
calibration?

Fluke?  Others?

I am in NW Florida.

Thanks,

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
Behalf Of WB6BNQ
Sent: Friday, September 02, 2011 8:21 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage
standards

Hi Joe,

By far, send in a 731 as it is way more stable then the rest of what you
have.
Personally, if the price isn't too bad I would send both 731's in for cal.
Make
sure you ask for them to record what the values were before any adjustment
was
done and to put that into your report when they return it.  That way you
could
start to build up a history of how the 731's behave.  That is far more
important
!

Bill....WB6BNQ

"J. L. Trantham" wrote:

> OK.  Thanks for info that I did not know.  I'll have to actually read the
> manual.
>
> After the first set, it ranged from 10.00001 to 10.00010.  After the
second
> set of button pushes, it reads 10.00006 when connected to the 'black'
face,
> 9.99995 when connected to the 'white' face unit, and 10.00046 when
connected
> to the 335A.
>
> Now, the next question.
>
> If you were to spend the money to get something calibrated, what would you
> choose?
>
> If you chose one of the voltage standards, you could use that to
'calibrate'
> the meters, and, thus, the other standards.  However, if you chose one of
> the meters, you could use that to 'calibrate' the standards, and thus, the
> other meters.  And, another question, what, actually, can you get
> 'calibrated' on this list?
>
> And, I agree with Dave.  A man with one watch ........
>
> Thanks in advance.
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
> Behalf Of gbusg
> Sent: Friday, September 02, 2011 6:52 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage
> standards
>
> Hi Joe,
>
> To display one more digit of resolution on your HP 3457A, do this:
>
> 1. Press "DIGITS DISP"
> 2. Press "6"
> 3. Press "ENT"
>
> For a more quiet reading, do this:
>
> 1. Press "NPLC"
> 2. Press "100"
> 3. Press "ENT"
>
> After several hours warm-up, be sure to run "ACAL ALL".
>
> I'm guessing your HP 3457A might typically be within 10ppm at 10Vdc.
> Possibly within 5ppm but not likely better than that due to drift and
> stability issues.
>
> For example, my 3457A has drifted 5ppm since last "CAL 10"  (5 years ago).
>
> Of course in your case there's the uncertainty of not knowing when your
> instruments were last cal'd by previous owners.
>
> It sounds like you're a prime candidate to participate in a VDC
round-robin,
> as the other fellows are now discussing and proposing?
>
> Cheers!
> Greg
>
> ----- Original Message -----
> From: "J. L. Trantham" <jltran at att.net>
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Sent: Friday, September 02, 2011 5:02 PM
> Subject: [volt-nuts] Solartron 7081, other meters, and some voltage
> standards
>
> I have been testing my 'new' 7081 and suspect I have arrived at the
'usual'
> cross roads of what to believe.
>
> I have two Fluke 731B's that I got from 'the site'.  I replaced the
battery
> packs in months past and have left both on for the past 3 or 4 days along
> with the 7081 and other meters, an HP 3478A and an HP 3457A, as well as a
> Fluke 335A voltage standard set to 10.000000 volts, all from 'the site'.
>
> Regarding the 731B's, one is a 'white' face and the other is a 'black'
face
> and both are set to 10V.
>
> I left the 7081 connected to the 'black' face 731B, set to 7 X 9 (3.2s) in
> 'TRACK', and walked in to the shop to find it reading 10.000000.  When
> connected to the 'white' face 731B, it reads 9.999898 and, when connected
to
> the 335A, it reads 10.000392.
>
> The 3478A reads 10.0001, 10.0000, and 10.0005, respectively.  The 3457A
> reads 10.0001, 10.0000, and 10.0005, respectively.
>
> Soooooooo, what, if any, conclusions are reachable?  I am tempted to
believe
> that the 'black' face 731B and the 7081 are correct.  What are the odds?
>
> Thanks in advance.
>
> Joe
>
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